/*
- * "$Id: runloop.c 7647 2008-06-16 17:39:40Z mike $"
+ * Common run loop APIs for CUPS backends.
*
- * Common run loop APIs for the Common UNIX Printing System (CUPS).
+ * Copyright 2007-2014 by Apple Inc.
+ * Copyright 2006-2007 by Easy Software Products, all rights reserved.
*
- * Copyright 2007-2008 by Apple Inc.
- * Copyright 2006-2007 by Easy Software Products, all rights reserved.
+ * These coded instructions, statements, and computer programs are the
+ * property of Apple Inc. and are protected by Federal copyright
+ * law. Distribution and use rights are outlined in the file "LICENSE.txt"
+ * "LICENSE" which should have been included with this file. If this
+ * file is missing or damaged, see the license at "http://www.cups.org/".
*
- * These coded instructions, statements, and computer programs are the
- * property of Apple Inc. and are protected by Federal copyright
- * law. Distribution and use rights are outlined in the file "LICENSE.txt"
- * "LICENSE" which should have been included with this file. If this
- * file is missing or damaged, see the license at "http://www.cups.org/".
- *
- * This file is subject to the Apple OS-Developed Software exception.
- *
- * Contents:
- *
- * backendDrainOutput() - Drain pending print data to the device.
- * backendRunLoop() - Read and write print and back-channel data.
+ * This file is subject to the Apple OS-Developed Software exception.
*/
/*
#include "backend-private.h"
#include <limits.h>
-#ifdef __hpux
-# include <sys/time.h>
-#else
-# include <sys/select.h>
-#endif /* __hpux */
+#include <sys/select.h>
/*
if (errno != EAGAIN || errno != EINTR)
{
- perror("ERROR: Unable to read print data");
+ fprintf(stderr, "DEBUG: Read failed: %s\n", strerror(errno));
+ _cupsLangPrintFilter(stderr, "ERROR", _("Unable to read print data."));
return (-1);
}
for (print_ptr = print_buffer; print_bytes > 0;)
{
- if ((bytes = write(device_fd, print_ptr, print_bytes)) < 0)
+ if ((bytes = write(device_fd, print_ptr, (size_t)print_bytes)) < 0)
{
/*
* Write error - bail if we don't see an error we can retry...
if (errno != ENOSPC && errno != ENXIO && errno != EAGAIN &&
errno != EINTR && errno != ENOTTY)
{
- _cupsLangPrintf(stderr, _("ERROR: Unable to write print data: %s\n"),
- strerror(errno));
+ _cupsLangPrintError("ERROR", _("Unable to write print data"));
return (-1);
}
}
ssize_t /* O - Total bytes on success, -1 on error */
backendRunLoop(
- int print_fd, /* I - Print file descriptor */
- int device_fd, /* I - Device file descriptor */
- int snmp_fd, /* I - SNMP socket or -1 if none */
- http_addr_t *addr, /* I - Address of device */
- int use_bc, /* I - Use back-channel? */
- void (*side_cb)(int, int, int, http_addr_t *, int))
- /* I - Side-channel callback */
+ int print_fd, /* I - Print file descriptor */
+ int device_fd, /* I - Device file descriptor */
+ int snmp_fd, /* I - SNMP socket or -1 if none */
+ http_addr_t *addr, /* I - Address of device */
+ int use_bc, /* I - Use back-channel? */
+ int update_state, /* I - Update printer-state-reasons? */
+ _cups_sccb_t side_cb) /* I - Side-channel callback */
{
int nfds; /* Maximum file descriptor value + 1 */
fd_set input, /* Input set for reading */
signal(SIGTERM, SIG_IGN);
#endif /* HAVE_SIGSET */
}
+ else if (print_fd < 0)
+ {
+ /*
+ * Copy print data from stdin, but don't mess with the signal handlers...
+ */
+
+ print_fd = 0;
+ }
/*
* Figure out the maximum file descriptor value to use with select()...
* Pause printing to clear any pending errors...
*/
- if (errno == ENXIO && offline != 1)
+ if (errno == ENXIO && offline != 1 && update_state)
{
- fputs("STATE: +offline-error\n", stderr);
- _cupsLangPuts(stderr, _("INFO: Printer is currently offline.\n"));
+ fputs("STATE: +offline-report\n", stderr);
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("The printer is not connected."));
offline = 1;
}
else if (errno == EINTR && total_bytes == 0)
{
fputs("DEBUG: Received an interrupt before any bytes were "
- "written, aborting!\n", stderr);
+ "written, aborting.\n", stderr);
return (0);
}
* loop since it may have read from print_fd...
*/
- (*side_cb)(print_fd, device_fd, snmp_fd, addr, use_bc);
+ if ((*side_cb)(print_fd, device_fd, snmp_fd, addr, use_bc))
+ side_cb = NULL;
continue;
}
if ((bc_bytes = read(device_fd, bc_buffer, sizeof(bc_buffer))) > 0)
{
fprintf(stderr,
- "DEBUG: Received " CUPS_LLFMT " bytes of back-channel data!\n",
+ "DEBUG: Received " CUPS_LLFMT " bytes of back-channel data\n",
CUPS_LLCAST bc_bytes);
- cupsBackChannelWrite(bc_buffer, bc_bytes, 1.0);
+ cupsBackChannelWrite(bc_buffer, (size_t)bc_bytes, 1.0);
+ }
+ else if (bc_bytes < 0 && errno != EAGAIN && errno != EINTR)
+ {
+ fprintf(stderr, "DEBUG: Error reading back-channel data: %s\n",
+ strerror(errno));
+ use_bc = 0;
}
+ else if (bc_bytes == 0)
+ use_bc = 0;
}
/*
if (errno != EAGAIN || errno != EINTR)
{
- perror("ERROR: Unable to read print data");
+ fprintf(stderr, "DEBUG: Read failed: %s\n", strerror(errno));
+ _cupsLangPrintFilter(stderr, "ERROR",
+ _("Unable to read print data."));
return (-1);
}
if (print_bytes && FD_ISSET(device_fd, &output))
{
- if ((bytes = write(device_fd, print_ptr, print_bytes)) < 0)
+ if ((bytes = write(device_fd, print_ptr, (size_t)print_bytes)) < 0)
{
/*
* Write error - bail if we don't see an error we can retry...
if (errno == ENOSPC)
{
- if (paperout != 1)
+ if (paperout != 1 && update_state)
{
- fputs("STATE: +media-empty-error\n", stderr);
- _cupsLangPuts(stderr, _("ERROR: Out of paper!\n"));
+ fputs("STATE: +media-empty-warning\n", stderr);
+ fputs("DEBUG: Out of paper\n", stderr);
paperout = 1;
}
}
else if (errno == ENXIO)
{
- if (offline != 1)
+ if (offline != 1 && update_state)
{
- fputs("STATE: +offline-error\n", stderr);
- _cupsLangPuts(stderr, _("INFO: Printer is currently off-line.\n"));
+ fputs("STATE: +offline-report\n", stderr);
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("The printer is not connected."));
offline = 1;
}
}
else if (errno != EAGAIN && errno != EINTR && errno != ENOTTY)
{
- fprintf(stderr, _("ERROR: Unable to write print data: %s\n"),
- strerror(errno));
+ _cupsLangPrintError("ERROR", _("Unable to write print data"));
return (-1);
}
}
else
{
- if (paperout)
+ if (paperout && update_state)
{
- fputs("STATE: -media-empty-error\n", stderr);
+ fputs("STATE: -media-empty-warning\n", stderr);
paperout = 0;
}
- if (offline)
+ if (offline && update_state)
{
- fputs("STATE: -offline-error\n", stderr);
- _cupsLangPuts(stderr, _("INFO: Printer is now online.\n"));
+ fputs("STATE: -offline-report\n", stderr);
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("The printer is now connected."));
offline = 0;
}
/*
- * End of "$Id: runloop.c 7647 2008-06-16 17:39:40Z mike $".
+ * 'backendWaitLoop()' - Wait for input from stdin while handling side-channel
+ * queries.
*/
+
+int /* O - 1 if data is ready, 0 if not */
+backendWaitLoop(
+ int snmp_fd, /* I - SNMP socket or -1 if none */
+ http_addr_t *addr, /* I - Address of device */
+ int use_bc, /* I - Use back-channel? */
+ _cups_sccb_t side_cb) /* I - Side-channel callback */
+{
+ int nfds; /* Number of file descriptors */
+ fd_set input; /* Input set for reading */
+ time_t curtime = 0, /* Current time */
+ snmp_update = 0;/* Last SNMP status update */
+ struct timeval timeout; /* Timeout for select() */
+
+
+ fprintf(stderr, "DEBUG: backendWaitLoop(snmp_fd=%d, addr=%p, side_cb=%p)\n",
+ snmp_fd, addr, side_cb);
+
+ /*
+ * Now loop until we receive data from stdin...
+ */
+
+ if (snmp_fd >= 0)
+ snmp_update = time(NULL) + 5;
+
+ for (;;)
+ {
+ /*
+ * Use select() to determine whether we have data to copy around...
+ */
+
+ FD_ZERO(&input);
+ FD_SET(0, &input);
+ if (side_cb)
+ FD_SET(CUPS_SC_FD, &input);
+
+ if (snmp_fd >= 0)
+ {
+ curtime = time(NULL);
+ timeout.tv_sec = curtime >= snmp_update ? 0 : snmp_update - curtime;
+ timeout.tv_usec = 0;
+
+ nfds = select(CUPS_SC_FD + 1, &input, NULL, NULL, &timeout);
+ }
+ else
+ nfds = select(CUPS_SC_FD + 1, &input, NULL, NULL, NULL);
+
+ if (nfds < 0)
+ {
+ /*
+ * Pause printing to clear any pending errors...
+ */
+
+ if (errno == EINTR)
+ {
+ fputs("DEBUG: Received an interrupt before any bytes were "
+ "written, aborting.\n", stderr);
+ return (0);
+ }
+
+ sleep(1);
+ continue;
+ }
+
+ /*
+ * Check for input on stdin...
+ */
+
+ if (FD_ISSET(0, &input))
+ break;
+
+ /*
+ * Check if we have a side-channel request ready...
+ */
+
+ if (side_cb && FD_ISSET(CUPS_SC_FD, &input))
+ {
+ /*
+ * Do the side-channel request, then start back over in the select
+ * loop since it may have read from print_fd...
+ */
+
+ if ((*side_cb)(0, -1, snmp_fd, addr, use_bc))
+ side_cb = NULL;
+ continue;
+ }
+
+ /*
+ * Do SNMP updates periodically...
+ */
+
+ if (snmp_fd >= 0 && curtime >= snmp_update)
+ {
+ if (backendSNMPSupplies(snmp_fd, addr, NULL, NULL))
+ snmp_fd = -1;
+ else
+ snmp_update = curtime + 5;
+ }
+ }
+
+ /*
+ * Return with success...
+ */
+
+ return (1);
+}
projects / thirdparty / cups.git / blobdiff